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Yet another rear disk question

original balzer

original balzer

1/2 ton status
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I should know this but I dont and I couldnt find my answer after pages and pages of reading through threads.

You would think someone would have done a write up by now.

Ok so its time to go get new studs and rotors for my 14b

Question is do I pin the rotor to the back of the hub with the studs?
Or do I put the studs in and put the rotor over the front of the hub?

Seams it would be too far outward to go the second route.
Yet not having the rotors and studs in hand it occurs to me the studs would be way bigger then the holes in the rotor.

I guess I should go buy the rotors and figure it out.
 
The brake drums get removed by pressing the studs out and then removing the drums, the rotors take place of the drums so the studs go through the rotors and press into the hubs. (the rotors are inboard mounted = behind the hub). You must be careful as i've discovered that not all front rotors are made the same, there is a recess where the head of the studs sits and some rotors the recess isn't large enough for the studs to press in properly so i have machined the head of the studs to 1" IIRC.
 
4X4HIGH said:
The brake drums get removed by pressing the studs out and then removing the drums, the rotors take place of the drums so the studs go through the rotors and press into the hubs. (the rotors are inboard mounted = behind the hub). You must be careful as i've discovered that not all front rotors are made the same, there is a recess where the head of the studs sits and some rotors the recess isn't large enough for the studs to press in properly so i have machined the head of the studs to 1" IIRC.
Click to expand...

what brake drums you been working on that are pressed on?
 
This is where I a at right now its just loosly put back together cuz I ended up having to order rotors calipers studs seals front lines and brake pads. Once all that shows up I will pull the hubs back off clean them up repack the bearings tap in the new seals and rotors and studs of course.

dbs8.jpg


The drum sat against the back side of the stud flange then the studs went through the drum and into the flange thats what I mean when I say pinned on. You cannot take the drum off the hub without driving the studs out.

EVERY 14B I have ever dealt with is this way. Newer ones may be differnt I dont know.

EDIT: The K30 I stole these axles from was an 85.......... So I dont know if newer is differnt. And heres a pic of the inside of the drums you can see the studs hold the drum on the hub
dbs4.jpg
 
4X4HIGH said:
The brake drums get removed by pressing the studs out and then removing the drums, the rotors take place of the drums so the studs go through the rotors and press into the hubs. (the rotors are inboard mounted = behind the hub). You must be careful as i've discovered that not all front rotors are made the same, there is a recess where the head of the studs sits and some rotors the recess isn't large enough for the studs to press in properly so i have machined the head of the studs to 1" IIRC.
Click to expand...


Missed this post sorry but this almost answers my question.

I know the rotors slip over the studs on the front. so I would think the stud holes in the rotor are slightly larger than the threaded part of the stud. The studs are bigger where they go through the drum. So Im curious if I will have to bore the holes in the rotor so the studs will go through. I guess I will see when the parts get here.
 
I didn't have too I bought new roros cuz they were real cheap got new studs for the ssmae reason. Go the the old studs out with a BFH and back in same way but with a punch
 
Big Blzn said:
My 72 shop manual that covers from 1/2-1 ton show that here are the two types available.
Pic from PBB.
View attachment 84621
Click to expand...

kgblazerfive said:
Pics from mine the studs hold the rotor to the hub
Click to expand...

Ok these 2 answer the main question and since nobody has ever said anything about boring the holes in the rotor I assume they fit.

just to be on the safe side I ordered rotors and calipers for a 1975 gmc 3/4 ton 4x4. Did I order the right ones? :haha:
 
kgblazerfive said:
I didn't have too I bought new roros cuz they were real cheap got new studs for the ssmae reason. Go the the old studs out with a BFH and back in same way but with a punch
Click to expand...

I thought I could use the rotors off the 83 I have but found out they are one piece with the hub on the front.

Cheap is another good reason, to buy new and it will be nice to have new parts.

Heres a question that doenst really matter but why did some get LONG studs whil others had short studs? I can see it on a dually axle but never understood why the single wheel trucks sometimes got long studs on the back.
 
You need front 4WD rotors, if your 83 is one piece it is a 2WD. :deal:

The 11" drums are a composite drum and got the shorter studs while the 13" drums are full cast and got the longer studs.
 
4X4HIGH said:
You need front 4WD rotors, if your 83 is one piece it is a 2WD. :deal:

The 11" drums are a composite drum and got the shorter studs while the 13" drums are full cast and got the longer studs.
Click to expand...

My 83 is 4wd and the hub and rotor are 1 piece. I can get a pic if youd like but I can assure you its 1 piece, and its 4wd. It also has a SF14b rear.
 
original balzer said:
My 83 is 4wd and the hub and rotor are 1 piece. I can get a pic if youd like but I can assure you its 1 piece, and its 4wd. It also has a SF14b rear.
Click to expand...

I would like to see a pic. There is no such thing as a 4WD with a one piece hub and rotor.
 
My studs go through the rotor and press into the hub. I used '79 3/4 ton 4wd rotors. I also used the dually studs just in case. I'm pretty sure the shorter studs will work with most steel rims, but you may need the longer studs for an aluminum rim with a thicker mounting surface.

714406665112_0_ALB.jpg

214406665112_0_ALB.jpg
 
4X4HIGH said:
I would like to see a pic. There is no such thing as a 4WD with a one piece hub and rotor.
Click to expand...


Well HOTT DAMN if what you see here does not exist then it must be worth a couple million bucks right?

Hate to sound snotty but it really pisses me off when someone tells me I dont have something that I actually do have. You even went so far as to say theres no such thing. Well here it is.

cc18-1.jpg


cc19-1.jpg


and an extreme close up of where they usually separate
cc20.jpg


OH yea see the black thing on the end thats a locking hub NOT found on 2wds it IS 4wd 4x4 whatever you want to call it but not 2wd. :deal::deal:

I had the question witch you answered and I thank you for that, BUT do not assume Im so stupid I dont know the differnce between a 2wd and a 4wd. Especially on my own truck.

Now people are not perfect and sometimes people word things in a way that comes off as cocky rude or arrogant. If this is the case then all is well and we can forget the whole thing.
 
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